package be.webchess.www.utils;

import java.security.MessageDigest;

public class MessageDigestHelper {

	private static String convertToHex(byte[] data) { 
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) { 
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do { 
                if ((0 <= halfbyte) && (halfbyte <= 9)) 
                    buf.append((char) ('0' + halfbyte));
                else 
                    buf.append((char) ('a' + (halfbyte - 10)));
                halfbyte = data[i] & 0x0F;
            } while(two_halfs++ < 1);
        } 
        return buf.toString();
    } 		
	
	public static String		sha1 ( String str )
	{
		byte[]			pass;
		MessageDigest	sha1;
		
		try {
			sha1 = MessageDigest.getInstance("SHA-1");
			
			sha1.update(str.getBytes());
			pass = sha1.digest();			
		} catch ( Exception ex )
		{
			return "";
		}
		
		return convertToHex(pass);
	}
	
}
